Sisters kid let my dog out and she bit someone else’s dog. Who’s at fault here?

I’m at my parents house doing school work, and my sisters five year old held the front door wide open for my dog to run out. Some lady then came to my parents door and claimed my dog bit there’s and they’re bringing the vet bill for us. My dog has been around many other dogs with some that interrogate her even and... show more I’m at my parents house doing school work, and my sisters five year old held the front door wide open for my dog to run out. Some lady then came to my parents door and claimed my dog bit there’s and they’re bringing the vet bill for us. My dog has been around many other dogs with some that interrogate her even and she doesn’t bite. Not sure I even believe the lady. But, besides that, who do you think is at fault here?
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